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November 1988

Revised July 2003

74AC138 • 74ACT138 1-of-8 Decoder/Demult iplexer

74AC138 • 74ACT138

1-of-8 Decoder/Demultiplexer

General Description

The AC/ACT138 is a high-speed 1-of-8 decoder/demulti-

plexer. This device is ideally suited for high-speed bipolar

memory chip select address decoding. The multiple input

enables allow parallel expansion to a 1-of-24 decoder

using just three AC/ACT138 devices or a 1-o f-32 decoder

using four AC/ACT138 devices and one inverter.

Features

■ICC reduced by 50%

■Demultiplexing capability

■Multiple input enable for easy expansion

■Active LOW mutually exclusive outputs

■Outputs source/sink 24 mA

■ACT138 has TTL-compatible inputs

Ordering Code:

Device a ls o av ailable in Tape and Ree l. Specify by app ending suffix let te r “X” to the ordering code .

Connection Diagram

Pin Descriptions

Logic Symbols

IEEE/IEC

FACT is a trademark of Fairchild Semiconductor Corporation.

Order Number Package Number Package Description

74AC138SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74AC138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74AC138MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74AC138PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

74ACT138SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74ACT138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74ACT138PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Pin Names Description

A0–A2Address Inputs

E1–E2Enable Inputs

E3Enable Input

O0–O7Outputs

www.fairchildsemi.com 2

74AC138 • 74ACT138

Truth Table

H = HIGH Voltage Le ve l L = LOW Voltage Level X = Immaterial

Functional Description

The AC/ACT138 high-speed 1-of-8 decoder/demultiplexer

accepts three binary weighted inputs (A0, A1, A2) and,

when enabled, provides eight mutually exclusive active-

LOW outputs (O0–O7). The AC/ACT138 features three

Enable inputs, two active-LOW (E1, E2) and one active-

HIGH (E3). All outputs will be HIGH unless E1 and E2 are

LOW and E3 is HIGH. This multiple ena ble function a llows

easy para lle l expansion of the de vice to a 1-of-32 (5 lines

to 32 li ne s) d eco der with j u st fo ur AC /ACT1 38 d evice s an d

one i nverter (see Figure 1). The AC/ACT13 8 can be use d

as an 8-output demultiplexer by using one of the active

LOW En abl e inp uts as the data i n pu t an d the oth er E nab le

inputs as strobes. The Enable inputs which are not used

must be pe rmanently tied to their appro priate active-H IGH

or active-LOW state.

Logic Diagram

Please note that this diagram is provided only for the understanding of logic

operations and should not be used to estimate propagation delays.

FIGURE 1. Expansion to 1-of-32 De coding

Inputs Outputs

E1E2E3A0A1A2O0O1O2O3O4O5O6O7

HXXXXXHHHHHHHH

XHXXXXHHHHHHHH

XXLXXXHHHHHHHH

LLHLLLLHHHHHHH

LLHHLLHLHHHHHH

LLHLHLHHLHHHHH

LLHHHLHHHLHHHH

LLHLLHHHHHLHHH

LLHHLHHHHHHLHH

LLHLHHHHHHHHLH

LLHHHHHHHHHHHL

3 www.fairchildsemi.com

74AC138 • 74ACT138

Absolute Maxim um Ratings(Note 1) Recommended Operating

Conditions

Note 1: Absol ut e maximum ratings are thos e v alues beyond whi c h damage

to the dev ice may occ ur. The databoo k specific ations sh ould be m et, with-

out exc eption, to e nsure that the system des ign is reliable over its power

supply, temperature, and output/input loading variables. Fairchild does not

recommend operation of FACT circuit s outside dat abook specif ic at ions.

DC Electrical Characteristics for AC

Note 2: All outputs lo aded; thres holds on inpu t as s oc iated with ou t put under test .

Note 3: Maximum test duration 2.0 ms, one output loaded at a time.

Note 4: IIN and ICC @ 3.0V are gu aranteed to b e les s t han or equal t o th e respective limit @ 5.5V VCC.

Supply Voltage (VCC)−0.5 V to +7.0V

DC Input Diode Current (IIK)

VI = −0.5V −20 mA

VI = VCC + 0.5V +20 mA

DC Input Voltage (VI)−0.5V to VCC + 0.5V

DC Output Diode Current (IOK)

VO = −0.5V −20 mA

VO = VCC + 0.5V +20 mA

DC Output Voltage (VO)−0.5V to VCC + 0.5V

DC Output Source

or Sink Current (IO)±50 mA

DC VCC or Ground Current

per Output Pin (ICC or IGND)±50 mA

Storage Temperature (TSTG)−65°C to +150°C

Junction Temperature (TJ)

PDIP 140°C

Supply Voltage (VCC)

AC 2.0V to 6.0V

ACT 4.5V to 5.5V

Input Voltage (VI)0V to V

Output Voltage (VO)0V to V

Operating Temperature (TA)−40°C to +85°C

Minimum Input Edge Rate (∆V/∆t)

AC Devices

VIN from 30% to 70% of VCC

VCC @ 3.3V, 4.5V, 5.5V 125 mV/ns

Minimum Input Edge Rate (∆V/∆t)

ACT Devices

VIN from 0.8V to 2.0V

VCC @ 4.5V, 5.5V 125 mV/ns

Symbol Parameter VCC TA = +25°CT

A = −40°C to +85°CUnits Conditions

(V) Typ Guaranteed Limits

VIH Minimum HIGH Level 3.0 1.5 2.1 2.1 VOUT = 0.1V

Input Voltage 4.5 2.25 3.15 3.15 V or VCC − 0.1V

5.5 2.75 3.85 3.85

VIL Maximum LOW Level 3.0 1.5 0.9 0.9 VOUT = 0.1V

Input Voltage 4.5 2.25 1.35 1.35 V or VCC − 0.1V

5.5 2.75 1.65 1.65

VOH Minimum HIGH Level 3.0 2.99 2.9 2.9

Output Voltage 4.5 4.49 4.4 4.4 V IOUT = −50 µA

5.5 5.49 5.4 5.4 VIN = VIL or VIH

3.0 2.56 2.46 IOH = −12 mA

4.5 3.86 3.76 V IOH = −24 mA

5.5 4.86 4.76 IOH = −24 mA (Note 2)

VOL Maximum LOW Level 3.0 0.002 0.1 0.1

Output Voltage 4.5 0.001 0.1 0.1 V IOUT = 50 µA

5.5 0.001 0.1 0.1 VIN = VIL or VIH

3.0 0.36 0.44 IOL = 12 mA

4.5 0.36 0.44 V IOL = 24 mA 0

5.5 0.36 0.44 IOL = 24 mA (Note 2)

IIN Maximum Input 5.5 ±0.1 ±1.0 µAV

I = VCC, GND

(Note 4) Leakage Current

IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max

IOHD Output Current (Note 3) 5.5 −75 mA VOHD = 3.85V Min

ICC

(Note 4) Maximum Quiescent

Supply Curre nt 5.5 4.0 40.0 µAV

IN = VCC or GND

www.fairchildsemi.com 4

74AC138 • 74ACT138

DC Electrical Characteristics for ACT

Note 5: All outputs loaded; thresholds on input assoc iat ed with outp ut under test.

Note 6: Maximum test dura tio n 2. 0 ms, one ou t put loaded at a tim e.

AC Electrical Characteristics for AC

Note 7: Voltage Range 3.3 is 3.3V ± 0.3V

Voltage Range 5. 0 is 5. 0V ± 0.5V

Symbol Parameter VCC TA = +25°CT

A = −40°C to +85°CUnits Conditions

(V) Typ Guaranteed Limits

VIH Minimum HIGH Level 4.5 1.5 2.0 2.0 VVOUT = 0.1V

Input Voltage 5.5 1.5 2.0 2.0 or VCC − 0.1V

VIL Maximum LOW Level 4.5 1.5 0.8 0.8 VVOUT = 0.1V

Input Voltage 5.5 1.5 0.8 0.8 or VCC − 0.1V

VOH Minimum HIGH Level 4.5 4.49 4.4 4.4 VI

OUT = −50 µA

Output Voltage 5.5 5.49 5.4 5.4 VIN = VIL or VIH

4.5 3.86 3.76 V IOH = −24 mA

5.5 4.86 4.76 IOH = −24 mA (Note 5)

VOL Maximum LOW Level 4.5 0.001 0.1 0.1 VI

OUT = 50 µA

Output Vo ltage 5 .5 0.001 0.1 0.1 VIN = VIL or VIH

4.5 0.36 0.44 V IOL 24 mA

5.5 0.36 0.44 IOL.= 24 mA (Note 5)

IIN Maximum Input 5.5 ±0.1 ±1.0 µAV

I = VCC, GND

Leakage Current

ICCT Maximum 5.5 0.6 1.5 mA VI = VCC − 2.1V

ICC/Input

IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max

IOHD Output Current (Note 6) 5.5 −75 mA VOHD = 3.85V Min

ICC Maximum Quiescent 5.5 4.0 40.0 µAV

IN = VCC or GND

Supply Current

VCC TA = +25°CT

A = −40°C to +85°C

Symbol Parameter (V) CL = 50 pF CL = 50 pF Units

(Note 7) Min Typ Max Min Max

tPLH Propagation Delay 3.3 1.5 8.5 13.0 1.5 15.0 ns

An to On5.0 1.5 6.5 9.5 1.5 10.5

tPHL Propagation Delay 3.3 1.5 8.0 12.5 1.5 14.0 ns

An to On5.0 1.5 6.0 9.0 1.5 10.5

tPLH Propagation Delay 3.3 1.5 11.0 15.0 1.5 16.0 ns

E1 or E2 to On5.0 1.5 8.0 11.0 1.5 12.0

tPHL Propagation Delay 3.3 1.5 9.5 13.5 1.5 15.0 ns

E1 or E2 to On5.0 1.5 7.0 9.5 1.5 10.5

tPLH Propagation Delay 3.3 1.5 11.0 15.5 1.5 16.5 ns

E3 to On5.0 1.5 8.0 11.0 1.5 12.5

tPHL Propagation Delay 3.3 1.5 8.5 13.0 1.5 14.0 ns

E3 to On5.01.56.08.01.09.5

5 www.fairchildsemi.com

74AC138 • 74ACT138

AC Electrical Characteristics for ACT

Note 8: Voltage Range 5. 0 is 5. 0V ± 0.5V

Capacitance

VCC TA = +25°CT

A = −40°C to +85°C

Symbol Parameter (V) CL = 50 pF CL = 50 pF Units

(Note 8) Min Typ Max Min Max

tPLH Propagation Delay 5.0 1.5 7.0 10.5 1.5 11.5 ns

An to On

tPHL Propagation Delay 5.0 1.5 6.5 10.5 1.5 11.5 ns

An to On

tPLH Propagation Delay 5.0 2.5 8.0 11.5 2.0 12.5 ns

E1 or E2 to On

tPHL Propagation Delay 5.0 2.0 7.5 11.5 2.0 12.5 ns

E1 or E2 to On

tPLH Propagation Delay 5.0 2.5 8.0 12.0 2.0 13.0 ns

E3 to On

tPHL Propagation Delay 5.0 2.0 6.5 10.5 1.5 11.5 ns

E3 to On

Symbol Parameter Typ Units Conditions

CIN Input Capacitance 4.5 pF VCC = OPEN

CPD Power Dissipation Capacitance 60.0 pF VCC = 5.0V

www.fairchildsemi.com 6

74AC138 • 74ACT138

Physical Dimensions inches (millimeters) unless otherwise noted

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

Package Number M16A

7 www.fairchildsemi.com

74AC138 • 74ACT138

Physical Dim ensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

www.fairchildsemi.com 8

74AC138 • 74ACT138

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Package Number MTC16

9 www.fairchildsemi.com

74AC138 • 74ACT138 1-of-8 Decoder/Demultip lexer

Physical Dim ensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Package Number N16E

Fairchild does not assume an y responsibility for use of any circuitry descr ib ed, no circuit patent licenses are implied and

Fairchild reserves the right at any time without notice to change said circuitry and specifications.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD

SEMICONDUCTOR CORPORATION. As used herein:

1. Life suppor t de vices o r syst ems are dev ic es or syste ms

which, (a) are intended for surgical implant into the

body, or (b) support or sustain life, and (c) whose failure

to perform when properly used in accordance with

instruct ions fo r use pr ovi de d in the l abe ling, can be rea-

sonably expected to result in a significant injury to the

user.

2. A crit ical componen t in any com ponen t of a life s uppor t

device or system whose failure to perform can be rea-

sonabl y e xpec ted to cause the fa i lure of the l ife support

device or system, or to affect its safety or effectiveness.

www.fairchildsemi.com

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ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This

literature is subject to all applicable copyright laws and is not for resale in any manner.

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